Wow, that's cool. I wonder what it is; maybe it's a combination of things. Surely all those supernovas make some noise!
My husband is an astronomer and he just got back from the AAS meeting in California last night! I asked him and he didn't hear anything about it but he said there was probably a press conference. There are so many different areas of astronomy, pull any astronomer aside and talk to him or her and you'll hear some amazing things.
My husband thought it was an interesting article lol; thanks for posting that!